The correct option is D All of the above
The gametophytic phase is represented by the single to few-celled haploid gametophyte. This kind of life cycle is termed as diplontic. Wherein the diploid sporophyte is the dominant, photosynthetic, independent phase of the plant. In addition, all seed bearing plants that means, gymnosperms and angiosperms, follow this pattern.
So, the correct answer is option 'd'.